JP2001168625A - Radio communication equipment and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain radio communication equipment capable of making the band characteristic of a chip antenna a wide band without deteriorating the radiation efficiency of the antenna. SOLUTION: This radio communication equipment is obtained by mounting the chip antenna 1 on a printed circuit board 2, and in the ground pattern 3 of the board 2, its total circumferential length is also close to one wavelength of the wavelength of a radio communication frequency band to be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable computer device having a wireless communication function, and more particularly to a wireless communication device such as a built-in wireless communication device for a portable computer with a chip antenna and a personal computer device with a wireless communication circuit. And electronic equipment.

[0002]

2. Description of the Related Art As one method of short-range wireless communication for mobile personal computers and portable terminal devices, there is a wireless communication method called "Bluetooth", which has been studied in recent years for practical use. This wireless communication system uses a frequency band of 2400 to 2483.5 [MHz], and uses frequency hopping in a spread spectrum system.

[0003] The hopping channel has 79 waves (2402 to 2480 [MHz]) at an interval of 1 [MHz], a transmission rate of 1 [Mbps], a communication distance of about 10 [m] at a transmission power of 0 [dBm], It is a relatively short distance of about 100 [m] at +20 [dBm].

When such a short-range wireless communication system wireless communication apparatus is mounted on a portable personal computer such as a notebook personal computer, an antenna projecting outside such as a rod antenna is an obstacle. We want to make it as little as possible to protrude from the inside of the personal computer even during use.

[0005] Therefore, as an antenna for this purpose,
Attention is focused on chip antennas. In a notebook personal computer, the liquid crystal display panel, which also serves as the lid, is attached to the rear upper end of the main unit to which the keyboard is attached and can be opened and closed by a structure that is supported at one end by a hinge. become. The personal computer employs a structure in which the inside of the housing of the main body and the inside of the lid housing are electromagnetically shielded with a conductive paint or a shield panel in order to prevent radiation of electromagnetic waves.

In addition, the main body is occupied by batteries, connectors, a floppy disk drive, a CD-ROM drive, a PC card slot, a board on which a CPU and various interface circuits for a memory are mounted, a keyboard, and the like. In the case of adopting a configuration that is built into a personal computer from the beginning, it is usually mounted on a lid incorporating a liquid crystal display panel.

However, in the case of the cover, opening and closing the liquid crystal display panel greatly changes the state around the mounted antenna, so that the band characteristic shifts.

Therefore, when a chip antenna is employed, it is necessary to use an antenna having a wide band.

As a technique of a chip antenna for widening the band, there is known a technique as disclosed in Japanese Patent Application Laid-Open No. 10-145124. The technology disclosed in this publication provides a chip antenna that has a wide bandwidth and can be used for a wireless device that transmits and receives a wide range of frequencies.

[0010] The chip antenna has a sectional dimension of several [mm].
It is a very small rectangular parallelepiped having a size of several mm and a length of about 1 cm or less. Specifically, this chip antenna is made of barium oxide, aluminum oxide,
Inside a small rectangular parallelepiped base mainly composed of silica,
There is a conductor spirally wound in the longitudinal direction of the base,
A resistor having one end connected to the conductor is provided on the surface of the base. Further, on the surface of the base, there is provided a structure having a power supply terminal for applying a voltage to the conductor via the other end of the resistor.

With such a structure, the conductor and the resistor are connected in series. By connecting the conductor and the resistor in series inside such a chip antenna, the substantial Q of the chip antenna can be reduced. This allows the bandwidth to be increased, as it can.

However, in this prior art, a resistor is provided inside the chip antenna to reduce Q,
Since the configuration is intended to increase the bandwidth, there is a problem.

That is, there is a limit to widening the band by this method of connecting a conductor and a resistor in series inside a chip antenna. That is, since the loss is increased by increasing the series resistance, the loss must be kept within an allowable range, which is a critical point for widening the band.

[0014]

In a portable personal computer such as a notebook personal computer, a liquid crystal display panel also serving as a lid is supported on one end by a hinge on a main body to which a keyboard is attached, thereby forming a cover like a book cover. Can be opened and closed. Then, due to the installation space and positional relationship, the chip antenna is attached to the liquid crystal display panel also serving as the lid, but in this configuration, the chip antenna is mounted by opening and closing the liquid crystal display panel also serving as the lid. Since the state around the antenna changes greatly, the band characteristics of the chip antenna shift.

Therefore, it is desired that the chip antenna built in the notebook personal computer has a wider band than the original wireless band. The bandwidth of the chip antenna is at most 100
[MHz], and there is a method of increasing the internal resistance to reduce the Q to increase the band, but the increase in the internal resistance increases the loss and deteriorates the radiation efficiency of the antenna.

As described above, in the related art, there is a limit in further increasing the band characteristics of the chip antenna.

Therefore, the object of the present invention is to:
An object of the present invention is to provide a wireless communication device and an electronic device capable of broadening the band characteristics of a chip antenna without deteriorating the radiation efficiency of the antenna.

[0018]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides: (1) First, a radio wave antenna of a predetermined frequency band, radio communication means connected to the antenna, and a peripheral length of one wavelength of the frequency band connected to the antenna. 0.7
And a ground pattern that is twice as long as 1.4 times as long.

In this configuration, the antenna of the wireless communication means is
This is connected to a ground pattern having a perimeter of 0.7 to 1.4 times one wavelength of the frequency band. According to this, the ground pattern itself resonates in the radio frequency band used by the radio communication means. I will be. Accordingly, this makes it possible to obtain sufficient band characteristics.

More specifically, a configuration is adopted in which, for example, a chip antenna is used as an antenna, and the chip antenna is mounted on a printed circuit board on which a ground pattern is formed. The circumference of the ground pattern of the printed circuit board is one of the wavelengths of the wireless communication frequency band to be used.
The length should be close to the wavelength.

Normally, a chip antenna alone can obtain a band of about 100 [MHz]. However, by setting the entire peripheral length of the ground to be close to one wavelength of the frequency of the radio band to be used, the printed circuit board itself can be obtained. Resonance occurs in this frequency band, so that the band of the wireless communication device can be widened to about 350 [MHz] to achieve a wider band.

(2) The present invention secondly provides 2.4.
[GHz] to 2.5 [GHz] radio wave antennas, wireless communication means connected to the antennas, and connected to the antennas, having a perimeter of 90 [mm] to 170 [mm]
And a ground pattern.

This configuration has a range of 2.4 GHz to 2.5 GHz.
The antenna of the wireless communication means using radio waves in the [GHz] band is connected to a ground pattern having a circumference of 90 [mm] to 170 [mm]. Thereby, 2.4
The ground pattern itself resonates with a signal having a frequency in the [GHz] to 2.5 [GHz] band. Therefore,
As a result, sufficient band characteristics can be obtained in the frequency band.

[0024] One of the short-range wireless communication methods, "Blue"
tooth ", 2.4 [GHz] to 2.5 [GHz]
Band radio waves are used.
The circumference length of 7 to 1.4 times is 90 [mm] to 1
When the antenna is connected to a ground pattern whose peripheral length is set to this length, the ground pattern itself resonates in the “Bluetooth” radio frequency band. Thus, sufficient band characteristics can be obtained in the “Bluetooth” wireless communication system.

(3) The present invention also provides, in a third aspect, a radio wave antenna of a predetermined frequency band, wireless communication means connected to the antenna, and a perimeter connected to the antenna and having a perimeter of the frequency band. A first ground pattern having a length of 0.7 to 1.4 times one wavelength, an inductance element connected to the first ground pattern, and a second ground pattern connected to the inductance element; It is characterized by having.

In this configuration, since the ground pattern has a large area or a complicated shape, the total perimeter of the ground pattern is not more than 0.
This is the most suitable configuration in the case of exceeding 7 to 1.4 times, and the ground pattern is divided into a plurality, for example,
The first ground pattern is divided into two, the first ground pattern is connected to the second ground pattern by an inductance element, and the first ground pattern is connected to the antenna. By connecting the first and second ground patterns via an inductance element, both are cut off in terms of high frequency and become conductive in terms of direct current. Therefore, in terms of AC, the antenna is connected to only the first ground pattern having a perimeter of 0.7 to 1.4 times one wavelength of the frequency band, According to this, the first ground pattern itself resonates in the radio frequency band used by the radio communication means.
Accordingly, this makes it possible to obtain sufficient band characteristics.

(4) The present invention is, fourthly, a display device having an information display portion and an electromagnetic shielding portion, a housing for accommodating the display device so that the information display portion surface can be visually recognized, An information processing means connected to the housing and processing information to be displayed on the display device; a wireless communication means for wirelessly communicating information processed by the information processing means; and a wireless communication means connected to the wireless communication means. An antenna disposed so as to protrude from the electromagnetic shielding portion region of the display device by a predetermined length, and the casing is configured to be electromagnetically excluding a portion corresponding to the region where the antenna is disposed. It is characterized in that it is configured to be a shielding area.

According to this configuration, the antenna is disposed in the housing accommodating the display device. The position of the antenna protrudes by a predetermined length from the electromagnetic shielding area of the display device. This antenna arrangement portion is removed. Therefore, there is no effect on the transmission and reception of the radio wave of the antenna, so that sufficient transmission and reception characteristics of the radio wave can be secured.

This configuration indicates that an antenna is mounted in the cover of an electronic device, for example, a portable personal computer, especially when considered. However, consideration will be given mainly to the characteristics of a wireless communication system in operation. Then, generally, the band shifts depending on the open / close state of the liquid crystal display (display device) incorporated in the lid, and the problem remains.
However, in the present invention, an antenna, for example, a chip antenna portion is arranged so as to protrude from a shield case of a liquid crystal display, and an electromagnetic shielding region of a lid portion is formed so as to avoid a region corresponding to a chip antenna arrangement portion. Therefore, the influence of transmission and reception of radio waves is eliminated, and sufficient transmission and reception characteristics of radio waves can be secured. Therefore, even if the band moves due to the opening / closing state of the lid of the portable personal computer in which the liquid crystal display is incorporated, deterioration of wireless communication can be suppressed by sufficiently widening the band.

(5) The present invention provides, fifthly, a display device having an information display section and an electromagnetic shielding section, information processing means for processing information displayed on the display apparatus, Wireless communication means for wirelessly communicating information processed by the means, and 2.4 [G] connected to the wireless communication means.
[GHz] to 2.5 [GHz] band radio wave antenna, and connected to this antenna and have a circumference of 90 [mm] to 170 [mm].
And a ground pattern of [mm], and the antenna is disposed on the display device so as to protrude from the electromagnetic shield region of the display device by a predetermined length.

According to this configuration, the antenna protrudes from the electromagnetic shielding area of the display device by a predetermined length.
The antenna of the wireless communication means using the radio wave of 4 [GHz] to 2.5 [GHz] band has a peripheral length of 90 [mm] to 17 [mm].
It is connected to a ground pattern of 0 [mm].
Because the antenna projects a predetermined length from the electromagnetic shielding area of the display device, the presence of the electromagnetic shielding area has no effect on the transmission and reception of radio waves, so that sufficient transmission and reception characteristics of radio waves can be secured. Instead, the ground pattern to which the antenna is connected has a perimeter of 90 [mm] to 170 [mm].
[Mm], 2.4 [GHz] to 2.5 [G
The ground pattern itself resonates with a signal having a frequency in the [Hz] band. Accordingly, this makes it possible to obtain sufficient band characteristics in the frequency band.

[0032] One of the short-range wireless communication methods, "Blue"
tooth ", 2.4 [GHz] to 2.5 [GHz]
Band radio waves are used.
The circumference length of 7 to 1.4 times is 90 [mm] to 1
When the antenna is connected to a ground pattern whose peripheral length is set to this length, the ground pattern itself resonates in the “Bluetooth” radio frequency band. Thus, sufficient band characteristics can be obtained in the “Bluetooth” wireless communication system.

(6) The present invention provides, in a sixth aspect, a display device having an information display portion and an electromagnetic shielding portion, information processing means for processing information displayed on the display device, Wireless communication means for wirelessly communicating information processed by the means, a radio wave antenna of a predetermined frequency band connected to the wireless communication means, and a peripheral length of one wavelength of the frequency band connected to the antenna. And a ground pattern that is 0.7 to 1.4 times as large as the above, and the antenna is disposed on the display device so as to protrude a predetermined length from the electromagnetic shielding area of the display device. I do.

According to this structure, the antenna protrudes from the electromagnetic shielding area of the display device by a predetermined length.
It is connected to a ground pattern 0.7 to 1.4 times the wavelength. Because the antenna projects a predetermined length from the electromagnetic shielding area of the display device, the presence of the electromagnetic shielding area has no effect on the transmission and reception of radio waves, so that sufficient transmission and reception characteristics of radio waves can be secured. Instead, the ground pattern to which the antenna is connected has a perimeter of 0.7 to 1.4 times one wavelength of the used radio frequency band, so that the ground pattern itself can be used for signals in the used radio frequency band. It resonates. Accordingly, this makes it possible to obtain sufficient band characteristics in the frequency band.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a ground pattern on a printed circuit board on which a chip antenna is mounted is resonated in a specific frequency band to obtain matching of an antenna input section in a wide band. An embodiment of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1A shows a configuration example of a wireless communication unit 10 according to one embodiment of the present invention.
The wireless communication unit 10 mounts a chip antenna 1, an RF circuit unit 4 as an analog circuit unit for processing transmitted / received radio waves, a baseband unit, and a digital circuit unit 5 as a digital processing system on a printed circuit board 2. It is configured.

FIG. 1B and FIG. 1C show an example of a circuit configuration in the vicinity of the chip antenna 1 and the RF module (such as a high-frequency circuit unit) 4 which are analog circuit parts. However, among them, as shown in FIG.
The present invention has a configuration in which the chip antenna 1 is attached to one side of a rectangular printed circuit board 2 in the vicinity of one longitudinal end of the printed circuit board 2. The printed board 2 has a rectangular shape, and a GND (ground) pattern 3 is formed on the printed board 2 with a large area.

[0038] GND with a large area printed pattern
(The shape of the ground pattern 3) is L-shaped in which the mounting portion of the chip antenna 1 and its vicinity are cut out in this example. The ground pattern 3 is used as a ground of at least an analog circuit of a wireless communication unit using the chip antenna 1.

In the present invention, when the shape of the ground pattern 3 is X in the vertical direction and Y in the horizontal direction, the sum of X and Y is 波長 wavelength of the radio band used. Is set so that the length is close to one wavelength of the wireless band used in consideration of the total peripheral length. That is, in the case of the rectangular ground pattern 3, the length in the vertical direction is X and the length in the horizontal direction is Y, so the total perimeter is 2 × (X + Y), and since X + Y is approximately 波長 wavelength, The doubling is about one wavelength.

As described above, the wireless communication unit 1 of the present invention
Numeral 0 denotes a configuration in which the chip antenna 1 is mounted on one side of the rectangular printed circuit board 2 near one end of the printed circuit board 2 in the longitudinal direction, and the ground pattern 3 of the analog circuit section has a vertical length X and a horizontal length. The ground pattern 3 itself resonates in the wireless band used by the wireless communication unit 10 by setting the sum of Y to be close to half the wavelength of the wireless band used. As a result, sufficient band characteristics can be obtained.

An experimental example is shown in Table 1 below. “Blueto
The operating frequency band of “oth” is 2400 [MHz] to 248.
At 3.5 MHz, one wavelength is 125 mm at 2400 MHz. In addition, 2483.5 [MH
One wavelength of z] is 120.8 [mm]. Therefore, Table 1 shows the result of verifying the band by using the ground pattern 3 having the peripheral length of the pattern within the range of the peripheral frequency including this frequency.

Table 1 --------------------------------------------- -GND size Total perimeter Frequency band Effect judgment [mm] [mm] [MHz] ------------------------------ ---------------- Y = 45, X = 20 130 358 Effective Y = 35, X = 20 110 201 Effective Y = 25, X = 20 90 147 Less effective Y = 25, X = 30 110 287 Effective Y = 25, X = 40 130 374 Effective Y = 25, X = 50 150 190 Effective Y = 25, X = 60 170 127 Less effective ------- --------------------------------------- As can be seen from Table 1, the GND pattern 3 size is
When Y = 45 [mm] and X = 20 [mm] (that is, the circumference length is 130 [mm]), the frequency band is 358.
[MHz], and the frequency band was conventionally 100 [MHz]. Also, Y = 35 [mm], X = 20 [mm]
When the length is set to 110 [mm], the frequency band becomes 201 [MHz], which is also clearly recognized as having an effect.

Also, Y = 25 [mm], X = 20 [m]
m] (ie, 90 [mm] in circumference)
The frequency band becomes 147 [MHz], which is effective compared to the conventional frequency band 100 [MHz], but the effect is small.

Also, Y = 25 [mm] and X = 30 [m]
m] (that is, the peripheral length is 110 [mm]), the frequency band is 287 [MHz], which is considered to be sufficiently effective as compared with the conventional frequency band 100 [MHz].

Also, Y = 25 [mm] and X = 40 [m
m] (i.e., the peripheral length is 130 [mm]), the frequency band is 374 [MHz], which is also considered to be sufficiently effective.

Also, Y = 25 [mm] and X = 50 [m]
m] (i.e., 150 [mm] in circumference), the frequency band is 190 [MHz], which is considered to be more effective than the conventional frequency band 100 [MHz].

When Y = 25 [mm] and X = 60 [mm] (that is, the perimeter is 170 [mm]), the frequency band becomes 127 [MHz], which is the conventional frequency band 100 [MHz]. Although the effect is recognized compared to], the effect is small.

From the above experimental results, the total perimeter 110 to 150 [mm] which is close to one wavelength (125 [mm]) of 2400 [MHz] to one wavelength (120.8 [mm]) of 2483.5 [MHz]. ], The frequency band is 374-190.
[MHz], which is 3.7 times to 1.9 times the conventional value, and when the total circumference is 90 [mm], the frequency band is 147 [MH].
z], and the total perimeter is 170 [mm], the frequency band is 127 [MHz], which is 1.47 times as large as the conventional 1.27 times.
Since the effect is reduced by a factor of two, it can be seen that if the total perimeter of the ground pattern 3 is set near one wavelength of the operating frequency band, there is a sufficient frequency band multiplication effect.

Therefore, it can be said that setting the entire circumference of the ground pattern to a value close to one wavelength of the radio band to be used has a remarkable effect on widening the band.

With an antenna alone, at most 100 [MH]
Although the band of [z] can be secured, by setting the entire circumference of the ground to be close to one wavelength of the frequency of the used radio band, a band of about 350 [MHz] can be obtained. It is considered that the reason is that when the ground pattern itself of the printed circuit board has such a total peripheral length, a resonance phenomenon occurs in the frequency band of the radio frequency used.

Therefore, when the ground pattern shape is selected in this way, the ground pattern itself resonates in this wireless band, so that sufficient band characteristics can be obtained.

According to the present invention, as shown in Table 1, "Bluet" whose operating frequency band is 2.4 [GHz] to 2.4835 [GHz].
In the case of “ooth”, it can be seen that the effective total perimeter in which the effect is sufficiently recognized is 110 [mm] to 150 [mm]. Therefore, when considering the wavelength range, a sufficiently good range is the band frequency. 0.88 wavelength (110 [mm]
/ 125 [mm] = 0.88 wavelength) to about 1.24 (1
50 [mm] / 121 [mm] = 1.239 wavelengths).

Although not sufficient, the total perimeter as a region where it has been confirmed that the band characteristics can be expanded more than before is 90 [mm] and 170 [mm], and the former has a wavelength range of 90 [mm]. mm] / 125 [mm] = 0.72 wavelength, and the latter is 170 [mm] / 121 [mm] = 1.40.
Because of the wavelength, it can be said that the effective total perimeter for which the effect is recognized is in the range of about 0.7 wavelength to about 1.4 wavelength of the band frequency.

From these facts, when the best range is estimated experimentally, the total peripheral length of the ground pattern on the printed circuit board is about one wavelength of the used band frequency, and specifically, the total peripheral length of the ground pattern is the band frequency. About 0.
7 to about 1.4 wavelengths, more preferably about 0.8 to about 1.25 wavelengths of the band frequency;
More preferably, it can be said that the band frequency is in the range of about 0.85 wavelength to about 1.05 wavelength.

Next, a specific example of mounting the wireless communication unit 10 using the printed circuit board on which the chip antenna 1 of the present invention is mounted will be described as a second embodiment.

(Second Embodiment) FIG. 2 shows a portable personal computer, for example, a notebook personal computer 20 mounted with a wireless communication unit 10 using a printed circuit board on which the chip antenna 1 of the present invention is mounted. FIG. As shown in FIG. 2, a flat panel display, for example, a liquid crystal display (LCD) is attached to the back side of the lid 20a of the notebook personal computer 20 (the liquid crystal display inside the housing constituting the lid 20a). 24 (on the rear side). The liquid crystal display 24 is covered with a metal plate case for both reinforcement and a magnetic shield, and the wireless communication unit 10 is mounted on the back surface of the shield case of the liquid crystal display 24 so that the ground pattern of the printed circuit board is positioned. .

However, in order to secure a favorable transmission / reception environment of the chip antenna 1, as shown in FIG. 2, the radio communication unit 10 is designed so that the antenna portion projects outward from the shield case of the liquid crystal display 24. And placed in the lid 20a.

The inside of the lid 20a is coated with a conductive paint,
When the whole is magnetically shielded, the wireless communication unit 10 has the antenna portion outside the lid 20a.
[Mm] or more.

The radio communication unit 10 used here has a radio band used of 2.4 [GHz] (12.5 wavelengths).
[Cm]) to 2.5 [GHz] (one wavelength is 12 [c]
m]), the entire circumference of the ground pattern 3 on the printed circuit board 2 of the wireless communication unit 10 is 13.5 [1.15 wavelengths, which is the wavelength 12.25 [cm] at the midpoint of the used wireless band. FIG. 3 shows the input VSWR (standing wave ratio) characteristics at the input section of the chip antenna 1 when the setting is made to be [cm].

As shown in the characteristic diagram, the wireless communication unit 10 is configured to be attached to the lid 20a of the notebook type personal computer device so that the antenna portion of the wireless communication unit 10 projects outward from the shield case of the liquid crystal display 24. In this way, the input VSW
The band where R ≦ 2 is about 100 [MHz] in the past, but can now be broadened to about 350 [MHz], and a stable input VSWR is maintained in both the open state and the closed state of the liquid crystal display. It can be seen that the characteristics have been obtained. Therefore, by adopting this mounting structure, it is possible to obtain a stable performance with respect to the antenna radiation characteristics.

FIG. 4 shows antenna radiation pattern characteristics on the xy plane in the structure of FIG.

A structure in which the chip antenna 1 portion protrudes from the upper end of the shield case of the liquid crystal display (LCD) 24 and is disposed on the back side thereof (disposed inside the lid 20a, and the chip antenna 1 is disposed from the upper end of the lid 20a. Part 5
[Mm] projecting the wireless communication unit 10 on the back side of the LCD).
When it is superimposed on the shield case of the liquid crystal display 24 without being protruded (disposed inside the lid 20a, the lid 20a
In the case of a structure in which the wireless communication unit 10 is arranged in the lid without projecting the chip antenna 1 from the upper end of the
Has a characteristic indicated by a broken line, and the latter is about 6 [d
B].

This difference of 6 [dB] is about half the distance when converted to the radio wave arrival distance. Therefore, when the inside of the lid 20a is electromagnetically shielded by applying a conductive paint or the like, it is necessary to receive radio waves arriving from the outside or to easily transmit radio waves to the outside. It is important that at least the structure protruding outward from the partial cover 20a of the chip antenna 1 is large, and the area of the ground pattern is large. However, if this structure is arranged so as to be superimposed on the back surface of the liquid crystal display 24, it protrudes. Since the portion is only the portion of the chip antenna 1 that has been miniaturized, the housing itself hardly becomes large. The amount of protrusion of the portion of the chip antenna 1 that protrudes outside from the lid 20a is 10 [mm].
It is about.

That is, in this embodiment, the radio communication unit 10 as the radio communication device has the structure as in the first embodiment, and only the chip antenna portion protrudes from the shield case of the liquid crystal display. With this structure, radio waves are easily emitted and wide directivity is obtained. The wireless communication unit 10 has a large ground pattern area on its printed circuit board. In this case, since the protruding portion is in the range of about 10 [mm] of the portion of the miniaturized chip antenna 1, the housing itself does not need to be substantially large.

The above is an example in which the total peripheral length of the ground pattern falls within the vicinity of one wavelength of the wavelength of the used frequency band. However, there are cases where the ground pattern area is large, the shape is complicated, and the total perimeter of the ground pattern does not fit in the vicinity of one wavelength of the frequency of the used wireless band.
A coping example in such a case will be described next as a third embodiment.

(Third Embodiment) In the third embodiment,
With respect to the ground pattern of the analog circuit portion around the chip antenna 1, the ground pattern 3a of the analog circuit portion around the chip antenna 1 is set so that the total perimeter is within one wavelength of the frequency of the used radio band.
And a circuit section 53 including a high-frequency circuit section and a baseband section
Is formed separately from the ground pattern 3b.
Then, the two ground patterns 3a and 3b are separated by a chip inductor 55 so as to be separated in terms of high frequency and connected in terms of direct current.

As a result, the divided ground patterns 3a and 3b are connected to each other in a DC manner, become high impedance in a high frequency, and are separated, thereby providing a high frequency. Look, chip antenna 1
The total peripheral length of the ground pattern 3a of the peripheral analog circuit section can be set to about one wavelength of the frequency of the used wireless band.

This embodiment is an example of coping with a case where the ground pattern area is large or the shape is complicated and the total peripheral length of the ground pattern does not fall within the vicinity of one wavelength of the frequency of the used radio band. In such a case, as described above, the ground pattern 3 is configured to be divided into a plurality of parts and to be separated from each other in high frequency. For example, FIG.
As an example of division, as shown in this figure, the ground pattern on the printed circuit board 2 is formed by dividing the area into 3a and 3b. 3a is a ground pattern of an analog circuit unit (wireless analog system in the wireless communication unit 10) around the chip antenna 1, and 3b is a ground pattern of a digital circuit unit 53 which is a digital processing system in the wireless communication unit 10. Although the two ground patterns 3a and 3b are integrated in terms of direct current, they are electrically connected by a chip inductor 55 so as to be separated in terms of high frequency.

That is, the wireless communication unit 10 having the configuration shown in FIG. 5, which is a plan view showing the third embodiment, is configured by mounting the chip antenna 1, the RF circuit section, and the baseband section on the printed circuit board 2. However, the ground pattern is not divided into a single area, but divided into two areas. By connecting the respective ground patterns 3a and 3b with the chip inductor 55, the two ground patterns 3a and 3b are connected in a DC manner and have a high impedance in a high frequency, so that they are separated. ing.

In the configuration shown in FIG.
Reference numeral 0 denotes a configuration in which the chip antenna 1 is mounted on one side of the rectangular printed circuit board 2 near one longitudinal end of the printed circuit board 2 in the same manner as the structure shown in FIG.
The printed circuit board 2 is rectangular and rectangular, and GND (ground) patterns 3a and 3b are formed on the printed circuit board 2 with a wide area.

A GND pattern printed over a large area
Are the first ground pattern 3a in the area of the mounting portion of the chip antenna 1 and the second ground pattern 3b formed in a part of the other area in this example.
It is divided into two regions instead of a lump.

The first ground pattern 3a is L-shaped with the chip antenna 1 mounting portion and its vicinity cut away. Also, the second ground pattern 3b is rectangular,
Although separated from the first ground pattern 3a, both are connected by the chip inductor 55, and thereby are integrated into a direct current.

In the present invention, the total extension distance of the outer shape of only the first ground pattern 3a is set to a length near one wavelength of the used radio band. Specifically, the total peripheral length of the outer shape of the first ground pattern 3a is set to a length near one wavelength of the used wireless band (0.8 of one wavelength of the used wireless band).
To about 1.25).

If the shape is rectangular, the length X in the vertical direction
And the sum of Y in the horizontal direction is 1 / of the wireless band to be used.
That is, the length is set to be close to two wavelengths.

As described above, the wireless communication unit 10 of the present invention as shown in FIG. 5 has a configuration in which the chip antenna 1 is mounted on one side of the rectangular printed circuit board 2 in the vicinity of one longitudinal end of the printed circuit board 2. The ground pattern 3 is divided into two parts (of course, it may be divided into three or more parts if necessary), and one of the ground patterns 3a
Is the length of the sum of the vertical length X and the horizontal length Y close to 波長 wavelength of the wireless band to be used (the total extension distance of the outer shape of the ground pattern 3a is the length near one wavelength of the wireless band to be used) (The length of about 0.8 to 1.25), the ground pattern 3a itself resonates in the radio band used by the radio communication unit 10 in terms of high frequency. As a result, sufficient band characteristics can be obtained.

As described above, in the third embodiment, the ground pattern 3a of the analog circuit section around the chip antenna 1
And a circuit section 53 including a high-frequency circuit section and a baseband section
From the ground pattern 3b at high frequency,
A chip inductor 55 is provided between each ground pattern.
By connecting with DC, it is connected in DC, and in high frequency, it becomes high impedance and is divided,
Thus, when viewed in terms of high frequency, the ground pattern 3a of the analog circuit section around the chip antenna 1 is configured so that its total perimeter is about one wavelength of the frequency of the used wireless band.

Therefore, even in the case where the total perimeter of the ground pattern as a whole is much longer than about one wavelength of the frequency of the radio band to be used, the ground pattern 3b of the analog circuit section can be replaced with the ground pattern 3b. The entire perimeter can be selected to be a value close to one wavelength of the frequency of the used radio band, whereby about 350 [MHz] as described above.
Band performance can be obtained.

(Fourth Embodiment) A fourth embodiment will be described with reference to FIGS. Here, the first embodiment and the third embodiment
An optimal example will be described in a case where it is not possible to secure a sufficient space for accommodating the wireless communication unit of the embodiment in the lid portion storing the liquid crystal display of the notebook type personal computer device.

FIG. 6 shows the structure of the fourth embodiment, and shows the structure and the positional relationship between the chip antenna 1 and the wireless module 60 in a notebook personal computer.

In the configuration of FIG. 6, the radio communication unit is divided into two parts, an antenna board part 2a on which the chip antenna 1 is mounted and a radio module board part 2b on which the radio module 62 is mounted. Are connected by a coaxial cable 61.

Also in this embodiment, the antenna substrate 2a
As a matter of course, the whole peripheral length of the ground pattern is set to a value close to one wavelength of the frequency of the used wireless band, as described above.

The antenna substrate 2a on which the chip antenna 1 is mounted is connected to the notebook personal computer 10
And the wireless module board 2b on which the wireless module 60 is mounted is attached to the main body 20b of the notebook personal computer 20.

Since the liquid crystal display 24 is electromagnetically shielded on the lid 20a of the notebook personal computer 20, the inner surface of the housing of the lid 20a is an electromagnetic shielding area 70 coated with a magnetic paint. A portion around which the chip antenna 1 is disposed is a non-electromagnetic shielding area where no magnetic paint is applied, as shown in FIG. Specifically, a portion where the chip antenna 1 is arranged has a width of about 1 [cm] around the periphery thereof as a non-electromagnetic shielding region where the magnetic paint is not applied.

With such a structure, since there is no electromagnetic shielding around the chip antenna 1, radio waves can be transmitted and received inside the housing of the lid 20a, and analog circuits around the chip antenna can be obtained. Part of the ground pattern,
By setting the total peripheral length to be about one wavelength of the frequency of the used radio band, the effect of widening the band can be enjoyed. In addition, since only the antenna substrate 2a is arranged on the back of the liquid crystal display 24 and the wireless module substrate 60 can be built in the main body 20b of the notebook personal computer 20, the housing of the notebook personal computer as a whole can be made thinner. Can be planned.

(Fifth Embodiment) Next, an improved example of the second embodiment will be described. In the fifth embodiment, the wireless communication unit according to the first or third embodiment is completely accommodated in a lid portion of a notebook personal computer device in which a liquid crystal display is stored, so that there is no protrusion. Here is an example.

FIGS. 8 and 9 are perspective views showing the configuration of the fifth embodiment when applied to a notebook personal computer. The wireless communication unit 10 described in FIGS. The configuration is such that the computer 20 is arranged in the housing of the lid 2a.

In the case of the second embodiment described with reference to FIG. 2, the inside of the housing of the lid 20a is electromagnetically shielded by applying a conductive paint or the like. If the wireless communication unit 10 is completely accommodated in the housing of the cover 20a, it is impossible to receive radio waves arriving from the outside or transmit the radio waves to the outside. Was made to protrude.

However, the formation of unnecessary protrusions outside the small chip antenna 1 is an obstacle to a miniaturized notebook personal computer.

Therefore, an embodiment will be described in which even the portion of the chip antenna 1 is completely housed in the housing of the lid portion 20a so as not to protrude outside the housing. In this embodiment, even the portion of the chip antenna 1 is completely accommodated in the housing of the lid portion 20a. In order to make it possible, in this embodiment, the inside of the housing of the lid 2a is coated with a conductive paint except for a portion corresponding to an area where the wireless communication unit 10 is mounted to form the electromagnetic shielding area 70. That is, in this embodiment, the conductive paint is not applied to the region where the wireless communication unit 10 is mounted in the housing of the lid 20a.

The liquid crystal display 2 is mounted on the housing of the lid 20a.
4 is accommodated, but the liquid crystal display 24 itself is covered with a metal plate on the back side in order to maintain strength and suppress radiation of electromagnetic waves, and is not coated with a conductive paint. The presence of the area has virtually no significant effect on leakage of electromagnetic waves.

In the present embodiment, as shown in the figure, on the back of the liquid crystal display 24 in the housing of the lid 20a,
The chip antenna 1 is mounted so that the portion thereof protrudes from the upper edge of the liquid crystal display 24. Since the housing of the cover 20a has a function like a frame for accommodating the liquid crystal display 24, the liquid crystal display 24 is not necessarily completely contained in the housing of the cover 20a.

Therefore, in the housing of the lid 20a, there is a space between the housing and the upper edge of the liquid crystal display 24. The wireless communication unit 10 is mounted on the back surface of the liquid crystal display 24 or on the inner wall surface of the housing of the lid 20a so that the chip antenna 1 portion protrudes from the upper edge of the liquid crystal display 24 using this space. Note that such attachment of the wireless communication unit 10 may be performed using an appropriate holding unit such as a double-sided adhesive tape.

At this time, the portion of the chip antenna 1 protrudes from the upper edge of the liquid crystal display 24 by about 10 [mm] so that the back metal plate of the liquid crystal display 24 is less susceptible to electromagnetic influences. Ideally a wireless communication unit 1
7 is good in the central upper region of the lid 20a as shown in FIGS.

In this way, the wireless communication unit 10
Is located in a region that is not electromagnetically shielded when viewed from the outside of the lid 20a, so that the chip antenna 1 can freely transmit and receive radio waves to and from the outside.

The area where the conductive paint is not applied is not the entire area of the wireless communication unit 10 but the chip antenna 1
May be used only. In this case, at least in a range of about 10 [mm] around the chip antenna 1,
An area where the conductive paint is not applied is formed. As shown in FIGS. 8 and 9, the wireless communication unit 10 includes a lid 20a.
Is ideally provided in the central upper region, but it may not be possible due to some restrictions.

In this case, the wireless communication unit 10
As shown at 0, the cover 20a may be provided in the upper region at a position closer to the right or left than the center of the cover 20a. Also in this case, the conductive paint is not applied to the area of the wireless communication unit 10 or the chip antenna part at a distance of about 10 [mm] around the chip antenna 1 part, and the chip antenna 1 part is located above the upper edge of the liquid crystal display 24. By protruding about 10 [mm], it is needless to say that the electromagnetic effect of the rear metal plate of the liquid crystal display 24 is reduced.

Although various embodiments have been described above, the present invention is, in summary, based on the totality of the ground patterns on the printed circuit board on which the chip antenna is mounted so that the ground patterns can resonate in a specific frequency band. The perimeter is set near one wavelength of the frequency of the specific frequency band, whereby the matching of the antenna input section can be obtained in a wide band, and the band can be widened. It is.

The present invention is not limited to the embodiment described above, but can be implemented in various modifications. Also,
Although the present invention has been described mainly with respect to an example in which the present invention is applied to a notebook personal computer device, the present invention is also applicable to various portable terminal devices, mobile devices, and stationary devices.

[0099]

As described in detail above, the present invention resonates a ground on a printed circuit board on which a chip antenna is mounted in a specific frequency band to obtain matching of an antenna input section in a wide band. And
The chip antenna is mounted on a printed circuit board, and only the antenna part is projected from the shield case of the liquid crystal display so that radio waves can be easily radiated and wide directivity can be obtained. It is.

According to the present invention, it is possible to provide a radio communication device and a personal computer device with a built-in radio communication device capable of broadening the band characteristics of a chip antenna without deteriorating the radiation efficiency of the antenna. it can.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the present invention, and is a diagram showing a configuration example of a wireless communication unit according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device showing a second embodiment of the present invention.

FIG. 3 is a diagram for explaining the present invention, in which the chip antenna 1 in the case where the entire peripheral length of the ground pattern 3 on the printed circuit board 2 of the wireless communication module 10 is set to 13.5 [cm]; Force VSWR at input
FIG. 9 is a (standing wave ratio) characteristic diagram.

4 is a diagram for explaining the present invention, and is a diagram showing antenna radiation pattern characteristics in the wireless communication unit having the structure of FIG. 2;

FIG. 5 is a view for explaining the present invention, wherein a ground pattern 3a of an analog circuit section around a chip antenna 1 and a ground pattern 3b of a digital circuit section 53 in a digital processing system according to a third embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration example of a wireless communication unit when the wireless communication units are separated from each other at a high frequency.

FIG. 6 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device according to a fourth embodiment of the present invention as viewed from the rear side.

FIG. 8 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device according to a fifth embodiment of the present invention.

FIG. 9 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device according to a fifth embodiment of the present invention.

FIG. 10 is a diagram for explaining the present invention, and is a perspective view showing a configuration example of a notebook personal computer device as a modified example of the fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chip antenna 2 ... Printed circuit board 3, 3a, 3b ... Ground pattern 10 ... Wireless communication unit 20 ... Notebook type personal computer device 20a ... Cover part of notebook type personal computer device 20b ... Notebook type personal computer device main body 24 ... Liquid crystal Display 70: Electromagnetic shielding area

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 3, 2000 (200.2.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

The inside of the lid 20a is coated with a conductive paint,
When the whole is magnetically shielded, the wireless communication unit 10 has the antenna portion outside the lid 20a.
[Mm] as Doma others more, so as to protrude.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction contents]

This difference of 6 [dB] is about half the distance when converted to the radio wave arrival distance. Therefore, when the inside of the lid 20a is electromagnetically shielded by applying a conductive paint or the like, it is necessary to receive radio waves arriving from the outside or to easily transmit radio waves to the outside. It is important that a structure in which at least a portion of the chip antenna 1 protrudes outside from the lid portion 20a is large, and the area of the ground pattern is large. Since only the part of the chip antenna 1 which has been miniaturized is formed, the housing itself is hardly large .

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 1/38 H04B 1/38

Claims (16)

[Claims] 1. An antenna for radio waves in the 2.4 [GHz] to 2.5 [GHz] band, wireless communication means connected to the antenna, and a circumference of 90 [mm] to 90 mm connected to the antenna. 1
And a ground pattern of 70 [mm]. 2. An antenna for radio waves in the 2.4 [GHz] to 2.5 [GHz] band, a high frequency circuit connected to the antenna, and a peripheral length of 90 [mm] to 1 connected to the antenna.
A wireless communication device comprising: a 70 [mm] ground pattern; and a printed circuit board on which the antenna, the high-frequency circuit, and the ground pattern are mounted. 3. The ground pattern has a peripheral length of 110.
The wireless communication device according to claim 1, wherein the range is [mm] to 150 [mm]. 4. An antenna for radio waves of a predetermined frequency band, wireless communication means connected to the antenna, and connected to the antenna, and having a perimeter of one of the frequency bands.
A ground pattern having a length of 0.7 to 1.4 times the wavelength. 5. An antenna for radio waves in a predetermined frequency band, a high-frequency circuit connected to the antenna, connected to the antenna, and having a perimeter of one of the frequency bands.
A wireless communication device comprising: a ground pattern having a length of 0.7 to 1.4 times the wavelength; and a printed board on which the antenna, the high-frequency circuit, and the ground pattern are mounted. 6. A wireless communication apparatus according to claim 1, wherein a peripheral length of said ground pattern is 0.8 to 1.25 times one wavelength of said frequency band. 7. An antenna for radio waves in the 2.4 [GHz] to 2.5 [GHz] band, wireless communication means connected to the antenna, and a peripheral length of 90 [mm] to 90 mm connected to the antenna. 1
Wireless communication comprising: a first ground pattern of 70 [mm]; an inductance element connected to the first ground pattern; and a second ground pattern connected to the inductance element. apparatus. 8. An antenna for radio waves in a predetermined frequency band, wireless communication means connected to the antenna, and connected to the antenna, and having a perimeter of one of the frequency bands.
A first ground pattern having a length of 0.7 to 1.4 times the wavelength, an inductance element connected to the first ground pattern, a second ground pattern connected to the inductance element, A wireless communication device comprising: 9. An information processing means for processing information, a wireless communication means for wirelessly communicating information processed by the information processing means, and connected to the wireless communication means, from 2.4 GHz to 2.
5 [GHz] band radio wave antenna, connected to this antenna and having a perimeter of 90 [mm] to 1
An electronic device comprising: a ground pattern of 70 [mm]. 10. An information processing means for processing information, a wireless communication means for wirelessly communicating information processed by the information processing means, a radio wave antenna connected to the wireless communication means and having a predetermined frequency band And a ground pattern connected to the antenna and having a circumference of 0.7 to 1.4 times one wavelength of the frequency band. 11. A display device having an information display unit and an electromagnetic shielding unit, information processing means for processing information displayed on the display device, and wireless communication of information processed by the information processing means. Wireless communication means, and an antenna connected to the wireless communication means, wherein the antenna is disposed on the display device so as to protrude a predetermined length from the shielding area of the display device. Electronic equipment. 12. A display device having an information display portion and an electromagnetic shielding portion, a housing surrounding the display device, and information processing means connected to the housing and processing information to be displayed on the display device. A wireless communication unit for wirelessly communicating information processed by the information processing unit; and a wireless communication unit connected to the wireless communication unit and arranged to protrude by a predetermined length from the electromagnetic shielding area of the display device. An electronic device, comprising: an antenna, wherein the housing is configured to be an electromagnetic shielding area except for a part corresponding to an area where the antenna is held. 13. A display device having an information display portion and an electromagnetic shielding portion, a housing surrounding the display device, and attached to the housing so as to be openable and closable to process information displayed on the display portion. A wireless communication unit for wirelessly communicating information processed by the information processing unit, an antenna connected to the wireless communication unit, and the electromagnetic shielding unit of the display device An electronic apparatus, further comprising: holding means for holding the antenna such that the housing further projects a predetermined length from a portion positioned above the main body in an open state with respect to the main body. 14. A display device having an information display portion and an electromagnetic shielding portion, information processing means for processing information displayed on the display device, and wireless communication of information processed by the information processing means. Wireless communication means, and 2.4 [GHz] to 2.4 [GHZ] connected to the wireless communication means.
5 [GHz] band radio wave antenna, connected to this antenna and having a perimeter of 90 [mm] to 1
An electronic device, comprising: a ground pattern of 70 mm; and wherein the antenna is disposed on the display device so as to protrude from the electromagnetic shield region of the display device by a predetermined length. 15. A display device having an information display unit and an electromagnetic shielding unit, information processing means for processing information displayed on the display device, and wireless communication of information processed by the information processing means. A radio communication means, an electromagnetic wave antenna of a predetermined frequency band connected to the radio communication means, and a ground connected to the antenna and having a circumference of 0.7 to 1.4 times one wavelength of the frequency band. An electronic device, comprising: a pattern, wherein the antenna is disposed on the display device so as to protrude from the electromagnetic shielding portion region of the display device by a predetermined length. 16. The electronic device according to claim 11, wherein an amount of protrusion of the antenna from the electromagnetic shielding portion region is at least 5 [mm].